Argopecten diminutivus (Hertlein and Jordan, 1927)
HERTLEIN, L. G. & E. K. JORDAN. 1927. Paleontology of the Miocene of Lower California. Proceedings of the California Academy of Sciences, Fourth Series, 16 (19): 605-647. [p. 623]
1927 Pecten (Plagioctenium) diminutivus Hertlein and Jordan, 1927
Pecten (Plagioctenium) calli Hertlein; L. G. Hertlein, 1925, Pectens from the Tertiary of Lower California, plate 4, figures 5, 7.
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«Pecten (Plagioctenium) calli Hertlein, Proc. Calif. Acad. Sci., 4th Ser., Vol. 14, No. 1, 1925, p. 16, pl. 4, figs. 5 and 7; "west side of Elephant Mesa, Scammon Lagoon Quadrangle, Lower California;" not Pecten calli Hertlein, pl. 4, fig. 6, "first arroyo east of Santiago, Lower California."
Shell small, right valve fairly flat and ornamented by 16 flattish topped to broadly rounded ribs which are separated by flattish bottomed interspaces which are very slightly narrower than the ribs; right ear well developed with strong byssal notch. Left valve convex with fairly high and rather sharp umbo, and ornamented by 15 to 16 ribs. Altitude 8 mm.; longitude 8 mm.; thickness 2.1 mm.; apical angle, approximately 98°. Holotype: No. 125 (L.S.J.U. type collection), from Loc. 60 (L.S.J.U.), west side of Elephant Mesa, Scammon Lagoon Quadrangle, Lower California; B. F. Hake collector; Isidro formation, lower Miocene. The writers [Proc. Calif. Acad. Sci., 4th Ser., Vol. 15, No. 14, 1926, p. 436] have previously pointed out that the Miocene species figured by Hertlein cannot be referred to Pecten calli Hertlein. It is small and may possibly be the young form of some described species, but several specimens have been found, and it seems best to refer to them with a definite name; Pecten (Plagioctenium) diminutivus is proposed. The species differs from other west coast Plagiocteniums in its small size and flattish right valve». LEO GEORGE HERTLEIN & ERIC KNIGHT JORDAN, 1927
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